Ford Expedition 4x4 lights blinking 9 times intermittently on Ford Expedition

Some Ford Expedition owners report experiencing issues with the 4x4 light blinking intermittently, which may indicate that the four-wheel-drive system has detected something out of range. This blinking light could serve as a service message, signaling that servicing is needed for the vehicle's 4x4 system. Additionally, some owners find that the light may blink due to an incomplete mode change, such as switching to 2WD or 4HI. Another potential cause is related to the transfer case speed sensors, which may be providing an incorrect signal regarding drive shaft output speed. It is crucial for owners to have the 4x4 system scanned for error codes to identify the specific issue, and if the light persists, consulting a qualified mechanic is recommended to address any underlying problems effectively.